20404012111031 has 2 divisors, whose sum is σ = 20404012111032. Its totient is φ = 20404012111030.

The previous prime is 20404012111003. The next prime is 20404012111039. The reversal of 20404012111031 is 13011121040402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20404012111031 - 2³⁰ = 20402938369207 is a prime.

It is a super-2 number, since 2×20404012111031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20404012110994 and 20404012111012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20404012111039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202006055515 + 10202006055516.

It is an arithmetic number, because the mean of its divisors is an integer number (10202006055516).

Almost surely, 2^{20404012111031} is an apocalyptic number.

20404012111031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404012111031 is an equidigital number, since it uses as much as digits as its factorization.

20404012111031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 20404012111031 its reverse (13011121040402), we get a palindrome (33415133151433).

The spelling of 20404012111031 in words is "twenty trillion, four hundred four billion, twelve million, one hundred eleven thousand, thirty-one".